Author Topic: NASA - Transiting Exoplanet Survey Satellite ( TESS ) updates  (Read 73173 times)

Online Rondaz

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TESS finds two new warm Jupiters

18:54 21 July 2022

Astronomers have confirmed two new exoplanet discoveries with the TESS space telescope. The telescope found two warm Jupiters orbiting sun-like stars that may have migrated through their systems in the past. A preprint of the work is available at arXiv.org.

Most of the known exogiants found by the transit method are hot Jupiters with periods of revolution around their stars of less than ten days, which are characterized by a high temperature of the outer layers. Due to their proximity to parent stars, their orbits cannot provide enough information about the mechanism of formation of such objects. However, the orbital parameters of exogiants more distant from stars, such as warm Jupiters, are less influenced by the parent star. Their orbital periods are in the range from 10 to 200 days, as in the case of hot Jupiters, if warm Jupiters do not form in the orbits where they are found, then there is a need for a mechanism for the planet to migrate through the system, from the point of formation to the point of detection.

A team of astronomers led by Solčne Ulmer-Moll of the Geneva Observatory in Switzerland announced the confirmation of two new discoveries of warm Jupiters, designated NGTS-20b (TOI-5152b) and TOI-5153b. The objects were initially detected by the TESS space telescope using the transit method, later the discoveries were confirmed by the radial velocity method using the CORALIE, FEROS, HARPS, CHIRON and TRES spectrographs installed on ground-based telescopes, and by the transit method using the NGTS (Next Generation) ground-based telescope system. transit survey).

In the case of NGTS-20b, the host star has a mass of 1.47 solar masses, a radius of 1.78 solar radii, and a spectral type of G1. An exoplanet with a mass of 2.98 Jupiter masses and a radius of 1.07 Jupiter radii revolves around it with a period of 54.19 hours. The orbital eccentricity of NGTS-20b is 0.432, and the equilibrium temperature is 688 Kelvin. The age of the system is estimated to be between 1.4 and 6.8 billion years, it is located at a distance of about 1200 light years from the Sun.

The parent star of the planet TOI-5153b is of type F8, has a mass of 1.24 solar masses and a radius of 1.4 solar radii. The exoplanet itself has an orbital period of 20.33 days, a mass of 3.26 Jupiter masses, and a radius of 1.06 Jupiter radii. The orbital eccentricity of the exogiant is 0.091, the equilibrium temperature is 906 kelvin. The age of the system is estimated at 5.4 billion years, and the distance to it is about 1270 light years.

Both exoplanets are enriched in metals, and their abundances of heavy elements are consistent with mass-to-metallicity models for gas giants. It is hypothesized that they may have formed through a high eccentricity migration process or migrated towards the star due to interactions with an undetected companion. Further observations should more accurately determine their nature.

Earlier, we talked about how TESS found two rocky exoplanets around a red dwarf very close to the Sun and an ultra-hot Jupiter falling into a star.

Alexander Voytyuk

https://nplus1.ru/news/2022/07/21/tess-new-exogiants

Offline briantipton

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In the case of NGTS-20b, the host star has a mass of 1.47 solar masses, a radius of 1.78 solar radii, and a spectral type of G1. An exoplanet with a mass of 2.98 Jupiter masses and a radius of 1.07 Jupiter radii revolves around it with a period of 54.19 hours.



That should be 54.19 days, not hours

Online FutureSpaceTourist

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https://www.nasa.gov/feature/goddard/2022/tess-status-update

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Oct 12, 2022

TESS Status Update

NASA’s Transiting Exoplanet Survey Satellite (TESS) entered into safe mode on Monday, Oct. 10. The spacecraft is in a stable configuration that suspends science observations. Preliminary investigation revealed that the TESS flight computer experienced a reset.

The TESS operations team reported that science data not yet sent to the ground appears to be safely stored on the satellite. Recovery procedures and investigations are underway to resume normal operations, which could take several days.

TESS launched in April 2018 and has since discovered more than 250 exoplanets – worlds beyond our solar system – and thousands of additional candidates. The agency will provide additional updates at www.nasa.gov/tess.

Media contact: Alise Fisher, NASA Headquarters / Claire Andreoli, NASA Goddard
Last Updated: Oct 12, 2022
Editor: Francis Reddy

Online FutureSpaceTourist

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https://www.nasa.gov/feature/goddard/2022/tess-status-update/

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Oct 14, 2022

TESS Status Update
TESS Resumes Normal Operations


NASA’s Transiting Exoplanet Survey (TESS) began its return to normal operations on Thursday, Oct. 13, at around 6:30 p.m. EDT. Engineers successfully powered up the instrument, and the spacecraft resumed its regular fine-pointing mode. The team expects that TESS will resume science observations later today, and all science data stored on the spacecraft will be downlinked at the next opportunity.

TESS entered into safe mode on Oct. 10 following a reset of its flight computer. The team will spend the next several days analyzing data to determine the cause. 

Launched in 2018, TESS has been scanning almost the entire sky looking for planets beyond our solar system, known as exoplanets. TESS has also uncovered other cosmic phenomena, including star-shredding black holes and stellar oscillations. Read more about TESS discoveries at www.nasa.gov/tess.

Media contact: Alise Fisher, NASA Headquarters / Claire Andreoli, NASA Goddard

Online FutureSpaceTourist

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https://twitter.com/haygenwarren/status/1582416124255211522

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On October 13, NASA's TESS spacecraft successfully returned to operations after entering safe mode due to a flight computer reset.

Meanwhile, researchers used TESS & Spitzer data to determine the presence of an atmosphere around a super-Earth exoplanet ⬇️

https://www.nasaspaceflight.com/2022/10/tess-safe-mode-incident/

Offline Star One

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A Low-Mass Pre-Main-Sequence Eclipsing Binary in Lower Centaurus Crux Discovered with TESS

We report the discovery of 2M1222-57 as a low-mass, pre-main-sequence (PMS) eclipsing binary (EB) in the Lower Centaurus Crux (LCC) association for which, using Gaia parallaxes and proper motions with a neural-net age estimator, we determine an age of 16.2±2.2 Myr. The broadband spectral energy distribution (SED) shows clear excess at ~10 um indicative of a circumbinary disk, and new speckle-imaging observations reveal a faint, tertiary companion separated by ~100 AU. H-alpha emission is modulated on the orbital period, consistent with theoretical models of orbitally pulsed accretion streams reaching from the inner disk edge to the central stars. From a joint analysis of spectroscopically determined radial velocities and TESS light curves, together with additional tight constraints provided by the SED and the Gaia parallax, we measure masses for the eclipsing stars of 0.74 Msun and 0.67 Msun; radii of 0.98 Rsun and 0.94 Rsun; and effective temperatures of 3750 K and 3645 K. The masses and radii of both stars are measured to an accuracy of ~1%. The measured radii are inflated, and the temperatures suppressed, relative to predictions of standard PMS evolutionary models at the age of LCC; also, the Li abundances are ~2 dex less depleted than predicted by those models. However, models that account for the global and internal effects of surface magnetic fields are able to simultaneously reproduce the measured radii, temperatures, and Li abundances at an age of 17.0±0.5 Myr. Altogether, the 2M1222-57 system presents very strong evidence that magnetic activity in young stars alters both their global properties and the physics of their interiors.

https://arxiv.org/abs/2211.07899

Offline Star One

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HD 20329b: An ultra-short-period planet around a solar-type star found by TESS

We used TESS light curves and HARPS-N spectrograph radial velocity measurements to establish the physical properties of the transiting exoplanet candidate found around the star HD 20329 (TOI-4524). We performed a joint fit of the light curves and radial velocity time series to measure the mass, radius, and orbital parameters of the candidate. We confirm and characterize HD 20329b, an ultra-short-period (USP) planet transiting a solar-type star. The host star (HD 20329, V=8.74 mag, J=7.5 mag) is characterized by its G5 spectral type with M=0.90±0.05 M, R=1.13±0.02 R, and Teff=5596±50 K; it is located at a distance d=63.68±0.29 pc. By jointly fitting the available TESS transit light curves and follow-up radial velocity measurements, we find an orbital period of 0.9261±(0.5×10−4) days, a planetary radius of 1.72±0.07 R⊕, and a mass of 7.42±1.09 M⊕, implying a mean density of ρp=8.06±1.53 g cm−3. HD 20329b joins the ∼30 currently known USP planets with radius and Doppler mass measurements.

https://arxiv.org/abs/2211.02547

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